What plant hardiness zone is Saint Charles

Saint Charles is located at Gregory County, South Dakota (SD), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Saint Charles is 5a by the USDA scale.

Coldest zone's winter temperature is −20 … -15 °F.

Plants of 5a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 5a USDA.

Saint Charles, South Dakota @ wikipedia.